最近做的项目，不需要后端接口，只需要前端验证，如图

初始页面

获取验证码

验证码的文件，直接复制就行

<template><div class="s-canvas"><canvasid="s-canvas":width="contentWidth":height="contentHeight"></canvas></div></template><script>export default {name: "SIdentify",props: {identifyCode: {// 默认注册码type: String,default: "1234",},fontSizeMin: {// 字体最小值type: Number,default: 25,},fontSizeMax: {// 字体最大值type: Number,default: 35,},backgroundColorMin: {// 验证码图片背景色最小值type: Number,default: 200,},backgroundColorMax: {// 验证码图片背景色最大值type: Number,default: 220,},dotColorMin: {// 背景干扰点最小值type: Number,default: 60,},dotColorMax: {// 背景干扰点最大值type: Number,default: 120,},contentWidth: {// 容器宽度type: Number,default: 90,},contentHeight: {// 容器高度type: Number,default: 38,},},methods: {// 生成一个随机数randomNum(min, max) {return Math.floor(Math.random() * (max - min) + min);},// 生成一个随机的颜色randomColor(min, max) {let r = this.randomNum(min, max);let g = this.randomNum(min, max);let b = this.randomNum(min, max);return "rgb(" + r + "," + g + "," + b + ")";},//画图drawPic() {let canvas = document.getElementById("s-canvas");//创建一个2D对象作为上下文。let ctx = canvas.getContext("2d");ctx.textBaseline = "bottom";// 绘制背景ctx.fillStyle = "#e6ecfd";ctx.fillRect(0, 0, this.contentWidth, this.contentHeight);// 绘制文字for (let i = 0; i < this.identifyCode.length; i++) {this.drawText(ctx, this.identifyCode[i], i);}this.drawLine(ctx);this.drawDot(ctx);},//在画布上显示数据drawText(ctx, txt, i) {ctx.fillStyle = this.randomColor(50, 160); // 随机生成字体颜色ctx.font =this.randomNum(this.fontSizeMin, this.fontSizeMax) + "px SimHei"; // 随机生成字体大小let x = (i + 1) * (this.contentWidth / (this.identifyCode.length + 1));let y = this.randomNum(this.fontSizeMax, this.contentHeight - 5);var deg = this.randomNum(-30, 30);// 修改坐标原点和旋转角度ctx.translate(x, y);ctx.rotate((deg * Math.PI) / 180);ctx.fillText(txt, 0, 0);// 恢复坐标原点和旋转角度ctx.rotate((-deg * Math.PI) / 180);ctx.translate(-x, -y);},// 绘制干扰线drawLine(ctx) {for (let i = 0; i < 4; i++) {ctx.strokeStyle = this.randomColor(100, 200);ctx.beginPath();ctx.moveTo(this.randomNum(0, this.contentWidth),this.randomNum(0, this.contentHeight));ctx.lineTo(this.randomNum(0, this.contentWidth),this.randomNum(0, this.contentHeight));ctx.stroke();}},// 绘制干扰点drawDot(ctx) {for (let i = 0; i < 30; i++) {ctx.fillStyle = this.randomColor(0, 255);ctx.beginPath();ctx.arc(this.randomNum(0, this.contentWidth),this.randomNum(0, this.contentHeight),1,0,2 * Math.PI);ctx.fill();}},},watch: {identifyCode() {this.drawPic();},},mounted() {this.drawPic();},};</script>

登录页面，运用验证码

<div style="position: relative;margin: 20px 0;"><el-input style="width: 100px;margin-right: 10px;" v-model="code" placeholder="验证码"> </el-input>//组件       <dentify v-if="identifyCode" :identifyCode="identifyCode" style="width: 100px;height: 4 0px;display: inline-block;position: absolute;top: 0px;"></dentify><el-button v-if="identifyCode" @click="refreshCode" style="margin-left: 100px;color: #c4c4c4;">换一换</el-button><el-button v-else  @click="refreshCode" style="color: #c4c4c4;">获取验证码</el-button>               
</div>
<el-button @click="Submit" class="buton">登录 </el-button>

import dentify from "@/components/dentify.vue";
export default {components: {dentify,},data() {return {code:'',identifyCodes: "1234567890abcdefjhijklinopqrsduvwxyz", //随机串内容,从这里随机抽几个显示验证码identifyCode: "", //验证码图片内容timer: null, //设置计时器count:'',};},methods: {
//判断验证码并提交async Submit() {console.log(this.count,'count')if(this.identifyCode ==''){this.$message({message: '获取验证码',type: 'warning'});}else if(this.count == 0){this.$message.error("验证码失效");}else if(this.code == ''){this.$message.error("验证码不能为空");}else if(this.identifyCode == this.code){await GET_LOGIN(this.form).then((res) => {console.log(res, "ress");if (res.code == 200) {this.$message({message: "登陆成功",type: "success",});} else {this.$message.error(res.msg);}});}else{this.$message.error("验证码错误");}},// 重置验证码并倒计时refreshCode() {this.identifyCode = "";this.count = ""this.makeCode(this.identifyCodes, 4);let TIME_COUNT = 60;if (!this.timer) {this.count = TIME_COUNT;this.timer = setInterval(() => {if (this.count > 0 && this.count <= TIME_COUNT) { this.count--;} else {clearInterval(this.timer);this.timer = null;}}, 1000);}},//获取验证码的值makeCode(o, l) {for (let i = 0; i < l; i++) {//通过循环获取字符串内随机几位this.identifyCode +=this.identifyCodes[this.randomNum(0, this.identifyCodes.length)];}},//随机数字：用于当角标拿字符串的值randomNum(min, max) {return Math.floor(Math.random() * (max - min) + min);},}}